Eyelet and method of making same



A ril 6, 1926. 7 1,579,221

' E. LUMBECK I EYELET AND METHOD OF MAKING SAME Original Filed July 16, 1924 Emil lam bee/f Patented Apr. 6, 1925 UNITE TES EMIL LUMBEGK, ELBERFELID, GERMANY, ASSIGNOR TO THE FIRM OF STOCK 82; 00.,

'- OF ELBERFEL'D-SONNBORN, GERMANY.

EYELE'I AND METHOD or. MAKING sAME.

Original application filed July 16, 1924, Serial No. 726,357. Divided and this application filed August 27, 1925. Serial No. 52,852.

To all whom it may concern:

Be it known that I, EMIL 'LUMBEOK, a citizen, of Germany, residing at Elberfeld,

' Germany, have invented certain new and useful Improvements in Eyelets and Methods of Making Same, of which the following is aspecification.

In fastening the known kinds of hooks and eyelets having hollow shanks which are made of sheet iron or other relatively hard metal such as hollow rivets, eyelets and hooks for laces, the drawback exists that the edge of the shank cracks or splits when it is being flanged. The resisting power of the hooks or eyelets is therefore reduced, while, in the case of iron hooks or eyelets, although a rust-protectingcoating may have beenapplied, it is not possible to avoid the formation of rust at the split or cracked parts.

Further, the sharp edges and projections which are formed with the cracks result in increased damage to or wear on the stockings and laces.

According to the invention, these drawbacks are eliminated by means of a new method of fastening the hooks and eyelets or the like. The new method consists essentiallyin that the edge of the shank is first doubled inwardly upon itself, and the double or folded edge is then flanged or rolled in known manner. Owing to the doubling or folding, the edge of the shank isstrengthened for the subsequent flanging so that it may be rolled to form a uniform flange or roll without splitting or cracking.

The doubling or the inward turning up of the edge of the shank suitably takes place immediately before the flanging or rolling operation and maybe eii'ected by means of the same tools whichefiect the said flanging or rolling operation. To this end, the edges of the shanks of the hooks or eyelets are iven, during their manufacture, a special form or. preliminary shape, which consists of an inwardly projecting flange or'collar provided at the edge of the shank said flange or collar being turned up inwardly to provi'de the required reenforcement in the subsequent flanging operation.

This application is a division of my copending application filed July 16, 1924, Serial No. 726,357.

In the drawings- 1 Figure 1 is sectional view through a strip of rivets depicting two of the rivets struck therefrom to form the tubular shanks, their bottoms having been left closed;

Fig. 2 is asimilar view with their bottoms punched out to leave an inwardly extending flange; f

Fig. 3 illustrates a further step in which the facingflange has been struck out from the rivet strip; 1

Fig. 4 shows the first step of folding the inner flange upwardly within the tubular shank; V

Fig. 5 shows the inner flange folded still further; a i i Fig. 6 depicts the reenforced lower end,

or attaching end of the shank rolled outwardly, and

Fig. 7 illustrates a preliminary shaped eyelet of the lacing hook type.

1 Referring now to the drawings, the eye lets are manufactured from a continuous rstrip of sheet metal a by pressing or draw ing parts of the sheet metal at regular intervals along the strip into the form o'f"cy lindrical or slightly conical shells or sleeves 6 having a bottom d for the purpose of forming a shank, then pressing the flange 0 around the upper edge of each shell or sleeve (Fig. 1) and then cutting or stamping a hole in the bottom of the shell or sleeve (Fig. 2) and finally separating the eyelet by stamping outthe flange from the strip of metal (Fig. This known process is modified, according to the present invention, in the following manner. The entire bottomd of the eyelet is not cut away, as hitherto, but a hole 1 is stamped in it, the diameter of which is somewhat smaller than the clear width of the lower endof the shank. There remains therefore, at the lower edge of the shank a portion of the bottom of the eyelet in the form of an inwardly projecting flange or collar 0, so that the eyelet possessesthe shape illustrated in Fig. 3. The eyelets can then as usual, be provided with a rust'protecting coating and, if desired, the flanges may also be enamelled.

Owing to the flange 0 which is formed at the end of the shank the fixing of the eye let by means of the customary Hanging or roller die takes place in a manner considerably different from that hitherto usual. hen the flanged edge of the shank is pressed by the upper punch against the flanging or roller die, the collar or flange 0 as well as in some cases that portion of the wall of the shank which is imn'iediately adjacent thereto is first turned or folded up inwardly. in the manner illustrated in Figs. 4: and 5, by means of the central upwardly projecting and generally conical mandrel of the lower die until it finally lies close against the inner wall of the shank (Fig. 5). The edge of the shank is thus doubled or folded on itself before the flanging operation begins, and is therefore strengthened for the flanging operation, which takes place immediately after the folding so that it no longer cracks or splits. For this reason the edge of the shank is no longer, as hitherto, simply spread or extended sideways to form a flat flange but through the resistance to radial spread set up by the doubled or reenforced portion is caused to roll uniformly outwards so that it forms, as shown in Fig. (3, an unbroken arched flange 2'. If the thickness of the leather or the like to which the eyelet is fastened permits, the edge of the shank after attaining its greatest diameter is even rolled inwardly again so that it forms a complete, annular roll. This possesses the advantage that the edge of the hole in the leather or the like which receives the shank of the eyelet is drawn together by the inwardly rolling edge of the shank, so that the eyelet is fastened in a particularly effective manner.

The above described method of forming the edges of the shank can, of course, also be employed for hollow rivets and hooks for laces as well as for eyelets. Fig. 7 shows by way of example, a hook for laces constructed in accordance with the invention, of which the shank Z) is provided with an inner flange 0 at its edge.

The edge of the shaft need, of course, not be bentinwardly to such a relatively great extent, as is shown in the drawings for the sake of clearness since a narrower turned up or folded portion suflices in practice. The essential feature is that in consequence of the folding up of the edge of the shank it is no longer the actual cut edge, as was formerly the case, which co-operates with the flanging or rolling die but the edge of the fold formed by turning up the end of the shank. The turning or folding of the edge of the shank instead of being effected when the hook or eyelet is being fastened,

i. 0. immediately prior to the Hanging or rolling operation, could in some cases also take place during the manufacture of the hooks and eyelets. namely. by a process which is separate in time and place from the process of Hanging or rolling the edge of the shank.

The new method and the new form of shank for the hooks and eyelets are particularly intended for hooks and eyelets of sheet iron or other relatively hard metal but it may also be zulvantageously employed for hooks and eyelets of other metals such as for example sheet brass, sheet aluminum and the like, for the purpose of obtaining with certainty a uniform rollingup of the edge of the shank without cracks occurring.

hat is claimed is 1. An eyelet or like fastening device having a tubular shank with a head flange at one of its ends and an internal reinforcement at its opposite end.

2. An eyelet or like fastening device embodying a tubular shank having an attach.- ing end brovided with an internal reinforcing flange.

An eyelet or like fastening device ha ving a tubular shank the attaching end of which has an inwardly and upwardly folded flange, lying within the shank, for add ing reinforcement thereto.

4. An eyelet or like fastening device com prising a tubular shank having an attaching end provided with a tubular reinforcing flange turned upward therefrom into the shank. concentric therewith.

5. An eyelet or like fastening device comprising av tubular shank having an attaching end provided with an inwardly extending flange folded upwardly against the inner wall of the shank, the doubled wall thus formed adapted to be rolled outwardly to form an attaching flange.

6. The method of forming eyelets or like fastening devices, consisting in forming a tubular eyelet shank with a closed end, forming an opening in the closed end of less diameter than the shank so as to leave an internal flange, and folding said flange upwardly into the interior of the shank so as to form a reinforcement at such end of the shank.

7. An eyelet embodying a tubular shank having an end portion adapted to be upset to form an attaching flange, said end portion being formed with a reinforcement disposed upon the inner side thereof.

8. An eyelet having a tubular shank, the attaching end of which is provided with a reinforcing flange extending into the shank.

S). An eyelet or like fastening device embodying a tubular shank having the end thereof which is to be rolled to form a clenching flange provided with a reinforcement lying inside such end.

10. A fastening device comprising a tubular shank having a setting flange of concavoconvex form and provided at its free edge with a reinforcement fold, said fold lapping 5 the convex face of said flange.

11. A fastening device comprising a tubular shank having at one end a head flange and having at its opposite end a setting flange of conoavo-convex form and provided at its free edge with a reinforcement fold, 10

said fold lapping the convex face of said flange.

In testimony whereof I aflix my signature.

EMIL LUMBECK. 

